Growth and Deposition of Au Nanoclusters on Polymer-wrapped Graphene and Their Oxygen Reduction Activity.
Growth and Deposition of Au Nanoclusters on Polymer-wrapped Graphene and Their Oxygen Reduction Activity.
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DOI：
10.1038/srep21314
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发表时间：
2016-02-22
影响因子：
4.6
通讯作者：
Nakashima N
中科院分区：
文献类型：
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作者：
Fujigaya T;Kim C;Hamasaki Y;Nakashima N
开发用于氧还原反应(ORR)的高性能无铂电催化剂是聚合物电解质燃料电池科学的核心问题之一。直径为~2 nm的金纳米颗粒(Au-NPs)是一种很有前途的铂纳米颗粒的替代品，然而，在不使用封端剂的情况下，在碳载体上合成如此小且直径分布较窄的Au-NPs仍然是一个挑战。我们描述了一种简单的方法，在涂有poly[2，2′-(2，6-pyridine)-5，5′-bibenzimidazole]的叠层石墨烯(<；10层)上沉积均匀的Au-NPs(直径 = 1.6 nm和3.3 nm)，而不使用任何封顶剂。所得到的Au-NPs表现出良好的ORR活性，其起始电势分别为−0.11 V和−0.09 V(vs.Ag/AgCl.)，分别为1.6 nm和3.3 nm。另一方面，平均直径为4.6 nm的非均匀Au-NPs在−0.15 V(vs.Ag/AgCl.)处显示出起始电势。
The development of a non-Pt electrocatalyst with a high performance for the oxygen reduction reaction (ORR) is one of the central issues in polymer electrolyte fuel cells science. Au-nanoparticles (Au-NPs) with a diameter of <2 nm are one of the promising substitutes of Pt-NPs; however, it is still a challenge to synthesize such a small-sized Au-NPs with a narrow diameter distribution on a carbon support without using capping agents. We here describe a facile method to deposit uniform Au-NPs (diameter = 1.6 nm and 3.3 nm) on the stacked-graphene (<10 layers) coated with poly[2,2′-(2,6-pyridine)-5,5′-bibenzimidazole] without using any capping agents. The obtained Au-NPs exhibit an excellent ORR activity with the onset potential at −0.11 V and −0.09 V (vs. Ag/AgCl) for 1.6 nm and 3.3 nm, respectively. On the other hand, inhomogeneous Au-NPs with 4.6 nm in average diameter shows the onset potential at −0.15 V (vs. Ag/AgCl).